/*      $NetBSD: arm.c,v 1.8 2025/06/04 05:52:48 martin Exp $   */

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>

#ifndef lint
__RCSID("$NetBSD: arm.c,v 1.8 2025/06/04 05:52:48 martin Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/cpuio.h>
#include <sys/sysctl.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <err.h>

#include "../cpuctl.h"

static const char * const id_isar_fieldnames[][8] = {
       {
               "Swap", "Bitcount", "Bitfield", "CmpBranch",
               "Coproc", "Debug", "Divde", NULL
       }, {
               "Endian", "Except", "Except_AR", "Extend",
               "IfThen", "Immediate", "Interwork", "Jazelle"
       }, {
               "LoadStore", "MemHint", "MultAccessInt", "Mult",
               "MultS", "MultU", "PSR_AR", "Reversal"
       }, {
               "Saturate", "SIMD", "SVC", "SynchPrim",
               "TabBranch", "ThumbCopy", "TrueNOP", "ThumbEE_Extn"
       }, {
               "Unpriv", "WithShifts", "Writeback", "SMC",
               "Barrier", "SynchPrim_frac", "PSR_M", "SWP"
       }
};

static const uint8_t id_isar_boolean[] = {
       0x2f, 0xb7, 0x41, 0xf5, 0xfc
};

static const char * const id_mmfr_fieldnames[][8] = {
       {
               "VMSA-Support",
               "PMSA-Support",
               "Outermost-Shareability",
               "Shareability-Levels",
               "TCM-Support",
               "Auxiliary-Registers",
               "FCSE-Support",
               "Innermost-Shareability"
       }, {
               "L1-Harvard-Cache-VA",
               "L1-Unified-Cache-VA",
               "L1-Harvard-Cache-Set/Way",
               "L1-Unified-Cache-Set/Way",
               "L1-Harvard-Cache",
               "L1-Unified-Cache",
               "L1-Cache-Test-and-Clean",
               "Branch-Predictor",
       }, {
               "L1-Harvard-Foreground-Fetch",
               "L1-Unified-Background-Fetch",
               "L1-Harvard-Range",
               "Harvard-TLB",
               "Unified-TLB",
               "Mem-Barrier",
               "WFI-Stall",
               "HW-Access",
       }, {
               "Cache-Maintenance-MVA",
               "Cache-Maintenance-Set/Way",
               "BP-Maintenance",
               "Maintenance-Broadcast",
               NULL,
               "Coherent-Tablewalk",
               "Cached-Memory-Size",
               "Supersection-Support",
       },
};

static const uint8_t id_mmfr_present[] = {
       0x8c, 0x00, 0x00, 0x68
};

static const char * const id_pfr_fieldnames[][8] = {
       {
               "ThumbEE",
               "Jazelle",
               "Thumb",
               "ARM",
       }, {
               "Programmer",
               "Security",
               "M-profile",
               "Virtualization",
               "Generic-Timer",
       },
};

static const char * const id_mvfr_fieldnames[][8] = {
       {
               "ASIMD-Registers",
               "Single-Precision",
               "Double-Precision",
               "VFP-Exception-Trapping",
               "Divide",
               "Square-Root",
               "Short-Vectors",
               "VFP-Rounding-Modes",
       }, {
               "Flush-To-Zero",
               "Default-NaN",
               "ASIMD-Load/Store",
               "ASIMD-Integer",
               "ASIMD-SPFP",
               "ASIMD-HPFP",
               "VFP-HPFP",
               "ASIMD-FMAC",
       },
};

static const uint8_t id_mvfr_present[] = {
       0x80, 0x03,
};

static bool
print_features(const char *cpuname, const char *setname,
   const int *id_data, size_t id_len, const char * const id_fieldnames[][8],
   size_t id_nfieldnames, const uint8_t *id_boolean, const uint8_t *id_present)
{
       char buf[81];
       size_t len = 0;
       const char *sep = "";
       for (size_t i = 0; i < id_len / sizeof(id_data[0]); i++) {
               int isar = id_data[i];
               for (u_int j = 0; isar != 0 && j < 8; j++, isar >>= 4) {
                       const char *name = NULL;
                       const char *value = "";
                       char namebuf[24], valuebuf[12], tmpbuf[30];
                       if ((isar & 0x0f) == 0
                           && (id_present == NULL
                               || (id_present[i] & (1 << j))) == 0) {
                               continue;
                       }
                       if (len == 0) {
                               len = snprintf(buf, sizeof(buf),
                                   "%s: %s: ", cpuname, setname);
                       }
                       if (i < id_nfieldnames) {
                               name = id_fieldnames[i][j];
                       }
                       if (name == NULL) {
                               name = namebuf;
                               snprintf(namebuf, sizeof(namebuf),
                                   "%zu[%u]", i, j);
                       }
                       if (id_boolean == NULL
                           || (id_boolean[i] & (1 << j)) == 0
                           || (isar & 0xe) != 0) {
                               value = valuebuf;
                               snprintf(valuebuf, sizeof(valuebuf),
                                   "=%u", isar & 0x0f);
                       }
                       size_t tmplen = snprintf(tmpbuf, sizeof(tmpbuf),
                            "%s%s%s", sep, name, value);
                       if (len + tmplen > 78) {
                               printf("%s\n", buf);
                               len = snprintf(buf, sizeof(buf),
                                   "%s: %s: %s", cpuname, setname, tmpbuf + 2);
                       } else {
                               len = strlcat(buf, tmpbuf, sizeof(buf));
                       }
                       sep = ", ";
               }
       }
       if (len > 0) {
               printf("%s\n", buf);
       }
       return len > 0;
}

bool
identifycpu_bind(void)
{

       return false;
}

void
identifycpu(int fd, const char *cpuname)
{
       int *id_data;
       size_t id_isar_len = 0;
       size_t id_mmfr_len = 0;
       size_t id_pfr_len = 0;
       size_t id_mvfr_len = 0;
       bool found = false;

       if (sysctlbyname("machdep.id_isar", NULL, &id_isar_len, NULL, 0) < 0
           || sysctlbyname("machdep.id_mmfr", NULL, &id_mmfr_len, NULL, 0) < 0
           || sysctlbyname("machdep.id_pfr", NULL, &id_pfr_len, NULL, 0) < 0
           || sysctlbyname("machdep.id_mvfr", NULL, &id_mvfr_len, NULL, 0) < 0) {
               warn("sysctlbyname");
               return;
       }

       id_data = malloc(id_isar_len);

       sysctlbyname("machdep.id_isar", id_data, &id_isar_len, NULL, 0);
       found += print_features(cpuname, "isa features", id_data, id_isar_len,
           id_isar_fieldnames, __arraycount(id_isar_fieldnames),
           id_isar_boolean, NULL);

       free(id_data);
       id_data = malloc(id_mmfr_len);

       sysctlbyname("machdep.id_mmfr", id_data, &id_mmfr_len, NULL, 0);
       found |= print_features(cpuname, "memory model", id_data, id_mmfr_len,
           id_mmfr_fieldnames, __arraycount(id_mmfr_fieldnames),
           NULL /*id_mmfr_boolean*/, id_mmfr_present);

       free(id_data);
       id_data = malloc(id_pfr_len);

       sysctlbyname("machdep.id_pfr", id_data, &id_pfr_len, NULL, 0);
       found |= print_features(cpuname, "processor features", id_data,
           id_pfr_len, id_pfr_fieldnames, __arraycount(id_pfr_fieldnames),
           NULL /*id_pfr_boolean*/, NULL /*id_pfr_present*/);

       free(id_data);
       id_data = malloc(id_mvfr_len);

       sysctlbyname("machdep.id_mvfr", id_data, &id_mvfr_len, NULL, 0);
       found |= print_features(cpuname, "media and VFP features", id_data,
           id_mvfr_len, id_mvfr_fieldnames, __arraycount(id_mvfr_fieldnames),
           NULL /*id_mvfr_boolean*/, id_mvfr_present);

       free(id_data);

       if (!found)
               printf("CPU identification not implemented for this"
                   " architecture.\n");
}

int
ucodeupdate_check(int fd, struct cpu_ucode *uc)
{

       return 0;
}

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